^^^^^^
Using multiple U.S. stamps is a sign of White Supremacy, much like giving the OK sign. It's a dog whistle. A signal. A sign.
The stamp is a metaphor. It represents what Whites really want to do to all minorities: Stamp on their faces and stomp them into the ground.
Stamps themselves were borne of racism because they were invented by a British man involved in the slave trade, William Dockwra. Every time you mail a letter, you're part of the problem.
Unless we get rid of postage stamps, we will never see the end of structural racism, systemic racism, systematic racism, or institutional racism.
***
The only thing I've left out of this post is "The school-to-prison pipeline." I don't know where it fits in exactly, but it's important to use this phrase as much as possible, on every occasion no matter what the context or circumstance. Example:
Person A: "Can you pass me the box of Cornflakes?"
Person B: "OMG!!! THE SCHOOL-TO-PRISON PIPELINE!!!"
The end.